Combined radio phonograph recorder, phonograph, radio and circuit therefor



Sept. 1, 1931. 4

D. e. COH 'N 1,821,495 COMBINED RADIO PHONOGRAPH RECORDER, PHONOGRAPH, RADIO, ,AND CIRCUIT THEREFOR Filed May 27, 1930 3 Sheets-Sheet l as 75 c 7'01? 77 Sept. 1, 1931. col- N 1,821,495

COMBINED RADIO PHONOGRAPH RECORDER, PHONOGRAPH, RADIO, AND CIRCUIT THEREFOR Filed May 27, 1930 3 Sheets-Sheet 2 INVENTOR Sept. 1, 1931. D. G. COHEN COMBINED RADIO PHONOGRAPH RECORDER, PHONOGRAPH, RADIO, AND CIRCUIT THEREFOR Filed May 27, 1950 v s Sheets- Sheet 3 Patented Sept. 1, 1931 PATENT: OFFICE nAvIn G. oonnn, or BROOKLYN, NEW YORK COMBINED. RADIO PHONOGRAPH RECORDER, PHONOGRAIPH, RADIO AND CIRCUIT" f THEREFOR r I Application filed May 27, 1930. Serial No. 456,126.

My inventionrelates to a new and useful apparatus, .wherein a wireless, receiving electrophonographic soundreproducing apparatus and an ele'ctro-phonographic' sound recording apparatus, each of any conventional type, are so combined into one unitary construction through the medium of a novel electrical circuit, also of my invention, as to permit either the separate orthe simultaneous receiving and recording of sound, and also the reproducing of the records so made or other similar records by merely operating certain plugs or switches.

My invention further relates to a new and useful apparatus, wherein a wireless receiving apparatus and an electro-phon'ographic sound recording apparatus, each of any conventionaltype, are so combined into one unitary construction through the medium of a novel electrical circuit, also of my invention, as to permit either the'scparate ,or simultaneous receiving and recording of sound by merely operating a certain plug or switch. 4

My invention further relates to a new and useful combination wherein an electrophonographic sound recording apparatus, an electro-phonographic sound reproducing apparatus and a novel electrical circuit also 3 of my invention, are all so constructed so as to beattachable to-.a:wireless receiving apparatus to act as a unit with such wire less receiving apparatus, to permit either the simultaneous receiving and recording or '85 justthe receiving of sound, and also the reproducing of the records'so madeor other similar records by merely operating certain plugs'or switches. Myinvention further-relates to a new and useful combination wherein an electrophonographic sound recording apparatus, and a 'rnovelzelectrical circuit, also of my invention, are all so constructed so as to be attachable to a wireless receiving apparatus toact asa unit with such wireless receiving apparatus, to permit either the simultaneous receiving and recording or just the receiving of sound by merely operating a certain plug or switch.

and novel electrical circuit capable of being operatively interposed between a wireless recelvingapparatus and an electrical sound recording apparatus, enabling them to act as a unit to permit either the simultaneous receiving and recording or just the receiving of sound, by merely operating a plug or switch.

For the purpose of illustrating my invention, I have shown in the accompanying P drawings forms thereof which are at present preferred by me since they will give in practice satisfactory and reliable results, although it' is to be understood that the various instrumentalities of which my invention consists can be variously arranged and organized, and that my invention is not limited to the precise arrangements of the organization of the instrumentalities as herein shown and described. 1

,Referring to the drawings Fig. 1 is a diagram of the audible frequency amplifier of my wireless receiving electro-phonographic sound recording and reproducing combination. hile receiving, plug P1 of the reproducing apparatus and plug P2 of the recording apparatus are in the positions shown. To record, P2 is plugged into jack J2 of my electrical circuit.

This operation willicause some of the electricalwave energy to be shunted to the cutting stylus apparatus CS by means .of my electrical circuit having capacities Cl and C2 and the'pack J2. The cutting stylus S2 is then made to track in'a. groove of a blank phonograph or dictaphone, disc or cylinder, made from material of suitable hardness, that has been placed on the phonograph turntable PT, or other rotating device, and

made to revolve at standard phonograph or other speed. A record will thus be made of broadcast matter while receiving. When through recording P2 should be removed from J2. 3 I

This record, and other similar records, may be reproduced by revolving the disc or'cylinder on the phonograph turntable or other rotating device, at the same speed that it was recorded, placingthe stylus S1 of the pho- My invention further relates to, a new nograp'h pickup PPin the beginning of the i groove and plugging P1 into the jack J 1.

A variable rheostat R, having a minimum resistance of practically zero, is "placed in the secondary circuit of the output transformer T3. If a great volume of sound is not desirable while recording, or if no sound is wanted at all, this resistance may be increased to a point, where the sound is not so great or not heard at all. This increase in resistance of It helps to produce a better quality record by automatically increasing the impedance of the primary of the output transformer.

My wireless receiving electro-phonographic sound recording combination is the same in all respects as Fig. 1, except that it has no phonograph pickup or phonograph pickup receptacle J1. Recording is performed in the same manner as'before;

Fig. 2 is a diagram of my electro-phonographic sound recording and reproducing and electrical circuit combination. It is attached to a wireless receiving set by remov ing the last audio push-pull stage tubes from their sockets, placing the tube adapters A1 and A2 in these sockets, and then placing the tubes in the adapters. These adapters connect the plates of said tubes to the condensers C1 and C2 of my electrical circuit. While receiving, plugs P1 and P2 of the recording and reproducing apparatus respectively are in position shown. To record, P1 is plugged into jack J1 of my electrical circuit. This operation will cause some of the electrical wave energy to be shunted to the cutting stylus apparatus, CS, by means of my said electrical circuit having capacities C1 and C2 and the jack J1. The cutting stylus S1 is then made to track in a groove of a blank phonograph or dictaphone disc or cylinder made from material of suitable hardness that has been placed on the phonograph turntable PT, or other rotating device, and made to revolve at standard phonograph'or other speed. 7 A record will thus be made of broadcast matter while receiving. When through recording, P1 should be removed from J1.

' This record, and other similar records, may be reproduced by revolving the disc or cylinder on the phonograph turntable or other rotating device, at the same speed that it was recorded, placing the stylus S2 of the phonograph pickup PP in the beginning of the groove of the disc or cylinder, and plugging P2 into the phonograph pickup receptacle of the wireless receiving set. If the set has no such receptacle, one must be provided. In Fig. 1, ack J1 is the phonograph pickup receptacle. V

My electro-phonographic sound recording and electrical circuit combination is the same in all respects as the apparatusillustrated inFig. 2, except that it has no phonograph pickup. It operates in the same manner for the purpose of recording only.

Fig. 3 shows in interrupted lines my elec-' trical circuit which I prefer as being most practical, however other forms are possible including those shown in Figures k9 inclusive, for shunting some of the electrical wave energy from the audible frequency amplifier of a wireless receiving set to electrical sound recording apparatus. Its terminals are connected to theplates-Pl and P2 of the last audio push-pull tubesVT1 and'VTQ or across the primary AB of the push-pull output transformer T at points X and Y. Any difference of potential existing across AB will be impressed between X and Y. This difiterence of potential will not cause any current'to flow through my circuit because it is open at the jack J1. It will therefore neither consume energy nor effect the impedance characteristics of the plate coupling. This is the condition of the circuit while receiving.

To record, the cutting stylus apparatus is plugged into jack J 1. This operation connects the circuit of the cutting stylus apparatus across the terminals of the ack J1, thus completing the circuit between X and Y. Any difference of potential between X and Y will cause current to flow through the cutting stylus circuit by means of the condensers G1 and C2, the jack J1 and the conductors shown. This will affect the impedance characteristics of the plate coupling,

however, if the impedance of the cutting stylus circuit and the primary of the output transformer are high enough, the quality of reception and the record will not be greatly affected. This circuit can be used to shunt electrical wave energy from any stage of the audible frequency amplifier to electrical sound recording apparatus. 7 In the combinations just described, enabling the recording and reproducing of broadcast matter, the electro-magnetic-phonograph pickup and the electro-magnetic cuttingstylus apparatus may be. one and the same unit, changing mechanical vibrations into electric currents when used as a pickup, and electric currents into mechanical vibrations when used as a cuttingjstylus apparatus. Local instead of broadcast matter may be recorded if desired, byfollowing the proceedings described for recording the latter, and also plugging a microphone into the phonograph pickupreceptacle.

The primary and outstanding feature of my invention is that it enables any conventional type of radio receiving apparatus or radio phonograph combination, to be used to make. phonographic records of broadcast matter. It will now be apparent that I have devised a novel and useful combination of a radio, phonograph recorder, phonograph,

ics

radio and circuit therefor, which will permit the accomplishment of the results enumerated in the statement of the invention and the above description, and while I have in the present instance, shown and described a preferred embodiment thereof, which will give in practice satisfactory and reliable results, it is to be understood that the same is susceptible of modification in various particulars without departing from the spirit or scope of the invention or sacrificing any of its advantages.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent is In combination with a radio receiver, an audio frequency amplifier connected to the radio receiver and having input and output circuits, a loudspeaker connected to said output circuit, a recording device also connected to the output circuit, and a microphone adapted for connection to the amplifier input circuit simultaneously with the radio receiver or independent thereof, whereby said radio receiver, microphone, or

either or both, may transmit wave energy I for simultaneous reproduction and record-- ing by the loudspeaker and recording device respectively.

In testimony whereof, I afiix my signature.

DAVID G. COHEN. 

